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9.6

Heater Power

The temperature controller controls the temperature of the bath by pulsing the
heater on and off. The total power being applied to the heater is determined by
the duty cycle or the ratio of heater on time to the pulse cycle time. This value
may be estimated by watching the red/green control indicator light or read di-
rectly from the digital display. By knowing the amount of heating to the bath
the user can tell if the bath is heating up to the set-point, cooling down, or con-
trolling at a constant temperature. Monitoring the percent heater power will let
the user know how stable the bath temperature is. With good control stability
the percent heating power should not fluctuate more than

±

1% within one

minute.

The heater power display is accessed in the secondary menu. Press “SET” and
“EXIT” simultaneously and release. The heater power is displayed as a percent-
age of full power.

S+E

Access heater power in secondary menu

12 Pct

Heater power in percent

To exit out of the secondary menu press “EXIT”. To continue on to the propor-
tional band setting function press “SET”.

9.7

Proportional Band

In a proportional controller such as this the heater output power is proportional
to the bath temperature over a limited range of temperatures around the
set-point. This range of temperature is called the proportional band. At the bot-
tom of the proportional band the heater output is 100%. At the top of the pro-
portional band the heater output is 0. Thus as the bath temperature rises the
heater power is reduced, which consequently tends to lower the temperature
back down. In this way the temperature is maintained at a fairly constant
temperature.

The temperature stability of the bath depends on the width of the proportional
band. See Figure 8. If the band is too wide the bath temperature will deviate ex-
cessively from the set-point due to varying external conditions. This is because
the power output changes very little with temperature and the controller cannot
respond very well to changing conditions or noise in the system. If the propor-
tional band is too narrow the bath temperature may swing back and forth be-

6020 Series Calibration Bath

User’s Guide

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Содержание 6020 Series

Страница 1: ...Fluke Corporation All rights reserved Specifications are subject to change without notice All product names are trademarks of their respective companies PN 3720771 Via Acquanera 29 22100 Como tel 031 526 566 r a fax 031 507 984 info calpower it www calpower it ...

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Страница 3: ...t 13 4 1 Unpacking 13 4 2 Set Up 13 4 3 Power 14 4 4 Setting the Temperature 14 5 Installation 17 5 1 Bath Environment 17 5 2 Dry out Period 18 5 3 Bath Preparation and Filling 18 5 4 Probe 18 5 5 Power 19 5 6 Tipping Prevention Brackets Installation 6024 with model 2072 cart only 19 5 6 1 Installation on a Concrete Floor 19 5 6 2 Installation of the Bath 19 6 Bath Use 21 6 1 General 21 6 2 Compar...

Страница 4: ...Mineral Oil 31 8 1 10 4 Silicone Oil 32 8 1 11 Fluid Characteristics Charts 32 8 1 11 1 Limitations and Disclaimer 32 8 1 11 2 About the Graph 32 8 2 Stirring 35 8 3 Power 35 8 4 Heater 35 8 5 Cooling 36 8 6 Temperature Controller 36 9 Controller Operation 39 9 1 Bath temperature 39 9 2 Reset Cutout 39 9 3 Temperature Set point 41 9 3 1 Programmable Set points 41 9 3 2 Set point Value 42 9 3 3 Set...

Страница 5: ...1 Wiring 54 10 1 2 Setup 54 10 1 2 1 Baud Rate 54 10 1 2 2 Sample Period 54 10 1 2 3 Duplex Mode 55 10 1 2 4 Linefeed 55 10 1 3 Serial Operation 55 10 2 IEEE 488 Communication optional 55 10 2 1 Setup and Address Selection 55 10 2 2 IEEE 488 Operation 56 10 3 Interface Commands 56 10 4 Power Control Functions 57 11 Calibration Procedure 61 11 1 Calibration Points 61 11 2 Measuring the Set point Er...

Страница 6: ...14 2 Chiller Parts and Controls 74 14 3 Chiller Controller Operation 75 iv ...

Страница 7: ...igure 4 Typical 6020 Series Calibration Bath 24 Figure 5 Back Panel 26 Figure 6 Chart of Various Bath Fluids 34 Figure 7 Controller Operation Flowchart 40 Figure 8 Bath Temperature Fluctuation at Various Proportional Band Settings 45 Figure 9 Serial Communications Cable Wiring 54 Figure 10 Calibration Example 63 Figure 11 6021 Back panel 75 ...

Страница 8: ...e 2 Table of Various Fluids and Their Properties 33 Table 3 Proportional Band Fluid Table 46 Table 4 Power Control Functions 57 Table 5 Interface Command Summary 58 Table 5 Interface Command Summary continued 59 Table 6 Auxiliary Chiller Control Functions 75 ...

Страница 9: ...the instrument or in this manual Symbol Description AC Alternating Current AC DC Battery CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On 1 1 Before You Start Symbols Used Table 1 International Electrical Symbols ...

Страница 10: ...ies conditions and actions that may damage the instru ment being used 1 2 1 Warnings To avoid personal injury follow these guidelines GENERAL Appropriate personal safety protection should be worn by the operator at all times while using the bath DO NOT use the instrument for any application other than calibration work The instrument was designed for temperature calibration Any other use of the uni...

Страница 11: ...ely dried prior to filling with fluid Any trapped water can cause a steam ex plosion resulting in personal injury If the bath has recently been filled with water ensure the inside of the drain tube is dry prior to filling the bath with fluid When immersing any object in the bath ensure that you are not introduc ing anything into the bath that will react with the bath fluid Ensure that probes are D...

Страница 12: ...gh voltage is used in the operation of this equipment Severe injury or death may result if personnel fail to observe the safety precautions Before working inside the equipment turn off the power and disconnect the power cord Keep all combustible materials away from the bath Operate the bath on a heatproof surface such as concrete Provide a means of safety for contain ing any spill which may occur ...

Страница 13: ...ot allow them to be dropped struck stressed or overheated DO ensure the fluid is cleaned from the probes prior to immersing the probe in the next bath Clean your probe between each bath to avoid con tamination between bath fluids Under filling the bath may reduce the bath performance and may possibly damage the bath When calibrating PRTs always follow correct calibration procedure and calibrate fr...

Страница 14: ...ce Centers Please contact one of the following authorized Service Centers to coordinate service on your Hart product Fluke Corporation Hart Scientific Division 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31...

Страница 15: ...r 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available Model Number Serial Number Voltage Complete description of the problem 7 1 Before You Start Authorized Service Centers ...

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Страница 17: ...e baths in tended mainly for the application of temperature calibration However their high stability and the availability of factory modifications such as a circulation pump make these baths suitable for other uses as well 9 2 Introduction Figure 1 6020 Series of Calibration Baths ...

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Страница 19: ... Hz 1518 W 115 230 VAC 10 50 60 Hz 1350 W 115 230 VAC 10 50 60 Hz 1350 W Auxiliary Chiller Outlet Power MAX NA 115 VAC 10 10 A 1150 W 230 VAC 10 5 A 1150 W NA NA System Fuse 115 VAC 15 A 250 V F 230 VAC 8 A 250 V F 115 VAC 20 A 250 V F 230 VAC 10 A 250 V F 115 VAC 15 A 250 V F 230 VAC 8 A 250 V F 115 VAC 15 A 250 V F 230 VAC 8 A 250 V F Heater Fuse 115 VAC 12 A 250 V F 230 VAC 6 A 250 V F 115 VAC ...

Страница 20: ...ndations can be found in the Maintenance Section of this manual The instrument operates safely under the following conditions ambient temperature range 5 40 C 41 104 F ambient relative humidity maximum 80 for temperature 31 C de creasing linearly to 50 at 40 C pressure 75kPa 106kPa mains voltage within 10 of nominal vibrations in the calibration environment should be minimized altitude less than 2...

Страница 21: ...ng any item please call an Authorized Service Center see Sec tion 1 3 or assistance 4 2 Set Up Set up of the bath requires careful unpacking and placement of the bath filling the bath with fluid installing the probe and connecting power Consult Section 5 for detailed instructions for proper installation of the bath Be sure to place the bath in a safe clean and level location Fill the bath tank wit...

Страница 22: ...o the right of each button or display value To view or set the bath temperature set point proceed as follows The front panel LED display normally shows the actual bath temperature 24 68 C Bath temperature display When SET is pressed the display will show the set point memory that is cur rently being used and its value Eight set point memories are available S Access set point selection 1 25 0 Set p...

Страница 23: ... quickly reach a higher temperature The HIGH setting may be necessary to reach higher tem peratures and control at high temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid The over temperature cutout should be correctly set to prevent this from happening See Section 9 8 To obtain optimum control stability adjust the proportional band...

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Страница 25: ...luid to prevent any injury To safely move the bath two people are required One person should lift the bath by the tower while the second person slides their hands underneath the bath tank and lifts the bath Refer to the Appendix specific to your bath model for additional installation instructions 5 1 Bath Environment CAUTION DO NOT place under a cabinet or other structure Allow for overhead cleara...

Страница 26: ...uid Care fully fill the bath through the large square access hole to a level that will allow for stirring and thermal expansion The fluid should never exceed a height of 1 2 below the top of the tank Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing Remove excess hot fluid if necessary with caution Use caution to prevent bath fluid from spilling ...

Страница 27: ...applies to the stability of the bath under normal operating conditions 5 6 1 Installation on a Concrete Floor Using a concrete drill and concrete drill bit drill three 1 4 inch x 1 1 4 inch deep approximately 6 5 mm x 32 mm holes in the concrete floor using the bracket to mark the hole placement Drop the flare anchor bolt into the hole Tightening the screw expands the anchor in the drilled hole an...

Страница 28: ...6020 Series Calibration Bath User s Guide 20 8 5 21 6cm Wall Caster Slots 8 5 21 6cm 16 029 40 714cm Front Figure 2 Tipping Prevention Bracket Installation ...

Страница 29: ...ld resistant surface or rack until they are at room temperature It is advisable to wipe the probe with a clean soft cloth or paper towel before inserting it into another bath This prevents the mixing of fluids from one bath to another If the probe has been calibrated in liquid salt carefully wash the probe in warm water and dry completely before transferring it to another fluid Always be sure that...

Страница 30: ...e metal apparatus When calibrating over a wide temperature range better results can generally be achieved by starting at the highest temperature and progressing down to the lowest temperature Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The ob ject is to keep the reference probe and the probe s...

Страница 31: ...rol buttons SET DOWN UP and EXIT are used to set the bath temperature set point access and set other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows SET Used to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of setable parameters UP Used to i...

Страница 32: ... ratio of heating to cooling When the indicator is red the heater is on and when it is green the heater is off and the bath is cooling 6020 Series Calibration Bath User s Guide 24 High Precision Bath Hart Scientific 1 2 3 4 6 5 6021 6022 only 6020 6021 6022 6024 Figure 4 Typical 6020 Series Calibration Bath ...

Страница 33: ...gs into the back of the bath at the power socket labeled STIRRER 4 On the bath lid is a large rectangular access hole This hole is used for fill ing and emptying the bath with fluids and placement of thermometers and de vices into the bath When possible the access hole should be covered The working area is defined as one inch from the sides and bottom and three inches from the top of the fluid 5 A...

Страница 34: ... fuses are located internally Never replace the fuse with one of a rating greater than that specified 4 The control probe plugs into the bath at the socket on the back of the bath labeled PROBE 5 If the bath is supplied with a serial RS 232 interface the interface cable is attached to the back of the bath at the connector labeled RS 232 6 If the bath is supplied with a GPIB IEEE 488 interface the ...

Страница 35: ... the bath by pumping fluid through the tubes 8 A drain valve is provided for ease of removing the fluid media from the bath Always use a container of adequate size to hold the full load of fluid Some oils are more easily drained at higher temperatures See caution note above 27 7 Parts and Controls Back Panel ...

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Страница 37: ...h temperature cannot exceed the safe operating temperature limit of the fluid 8 1 2 Viscosity Viscosity is a measure of the thickness of a fluid how easily it can be poured and mixed Viscosity affects the temperature stability of the bath With low vis cosity fluid mixing is better which creates a more uniform temperature throughout the bath This improves the bath response time which allows it to m...

Страница 38: ...h very high resistivity 8 1 7 Fluid Lifetime Many fluids degrade over time because of evaporization water absorption gel ling or chemical breakdown Often the degradation becomes significant near the upper temperature limit of the fluid substantially reducing the fluid s lifetime 8 1 8 Safety When choosing a fluid always consider the safety issues associated Obviously where there are conditions of ...

Страница 39: ... cools and drips into the bath Water is safe and relatively inert The electrical conductivity of water may pre vent its use in some applications Water has a limited temperature range from a few degrees above 0 C to a few degrees below 100 C At higher temperatures evaporation becomes significant Water used in the bath should be distilled or softened to prevent mineral deposits Consider using an alg...

Страница 40: ...seful with your bath 8 1 11 1 Limitations and Disclaimer The information given in this manual regarding fluids is intended only to be used as a general guide in choosing a fluid Though every effort has been made to provide correct information we cannot guarantee accuracy of data or assure suitablility of a fluid for a particular application Specifications may change and sources sometimes offer dif...

Страница 41: ...25 25 C 0 0007 50 C 5 25 C Dow Corning 200 5 Silicone Oil 40 C v 133 C fl cc 133 C 5 25 C 0 92 25 C 0 4 0 00028 25 C 0 00105 1000 25 C 10 150 C Dow Corning 200 10 5012 35 C v 165 C fl cc 165 C 10 25 C 3 135 C 0 934 25 C 0 43 40 C 0 45 100 C 0 482 200 C 0 00032 25 C 0 00108 1000 25 C 50 150 C Dow Corning 200 20 5013 7 C v 230 C fl cc 230 C 20 25 C 0 949 25 C 0 370 40 C 0 393 100 C 0 420 200 C 0 000...

Страница 42: ...S Centistokes EP Evaporation Point fluid loss due to evaporation FL Flash Point FR Freeze Point PP Pour Point Shaded area represents usable range of fluid starting at 50 centistokes Lighter shading represents decreasing viscosity while vaporization and decomposition increase Black area represents liquid range with excessive viscosity Range over which a fume hood is recommended 10 CS FL 302 C PP Si...

Страница 43: ...trol panel display will briefly show a four digit num ber This number indicates the number of times power has been applied to the bath Also briefly displayed is data which indicates the controller hardware configuration This data is used in some circumstances for diagnostic purposes 8 4 Heater The power to the bath heater is precisely controlled by the temperature control ler to maintain a constan...

Страница 44: ...emperature is controlled by Hart Scientific s unique hybrid digi tal analog temperature controller The controller offers the tight control stability of an analog temperature controller as well as the flexibility and programmabil ity of a digital controller The bath temperature is monitored with a platinum resistance sensor in the con trol probe The signal is electronically compared with the progra...

Страница 45: ...ion of the controller using the front control panel is discussed in Section 9 Operation using the digital interfaces is discussed in Section 10 When the controller is set to a new set point the bath will heat or cool to the new temperature Once the new temperature is reached the bath usually takes 10 15 minutes for the temperature to settle and stabilize There may be a small overshoot or undershoo...

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Страница 47: ...ath temperature in degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button 9 2 Reset Cutout If the over temperature cutout has been triggered then the temperature display will alternately flash cutout Indicates cutout condition The message continues to flash until the temperature is reduced and the cutout is reset The cutout has two mode...

Страница 48: ...ET EXIT Probe Menu R0 ALPHA Adj R0 Adj ALPHA SET EXIT Serial Interface Menu BAUD Rate Adjust BAUD Rate Sample Period Adj Sample Period Duplex Mode Adj Duplex Mode Linefeed Adjust Linefeed EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT EXIT SET Display Power Set Proportional Band Set Cutout Temp EXIT EXIT EXIT SET SET SET SET SET SET SET SET SET SET Reset Cutout Select Setpoint Adjust Setpoint EXIT E...

Страница 49: ...limit of the fluid Setting the bath temperature involves three steps 1 select the set point mem ory 2 adjust the set point value and 3 adjust the vernier if desired 9 3 1 Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the bath to a previously programmed tem perature set point To set the bath temperature on...

Страница 50: ...y to achieve a precise bath temperature The set point vernier allows one to adjust the temperature below or above the set point by a small amount with very high resolution Each of the 8 stored set points has an associated vernier setting The vernier is accessed from the set point by pressing SET The vernier setting is displayed as a 6 digit num ber with five digits after the decimal point This is ...

Страница 51: ...memory 1 25 0 Set point memory S Access set point value C 40 00 Set point value S Access vernier 0 00000 Vernier setting S Access scale units selection Un C Scale units currently selected Press UP or DOWN to change the units Un F New units selected Press SET to accept the new selection and resume displaying the bath temperature S Set the new units and resume temperature display 9 5 Secondary Menu ...

Страница 52: ... the secondary menu press EXIT To continue on to the propor tional band setting function press SET 9 7 Proportional Band In a proportional controller such as this the heater output power is proportional to the bath temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bot tom of the proportional band the heater output...

Страница 53: ...tting is used so that the change in output power per change in temperature remains the same The proportional band should also be wider when the fluid viscosity is higher because of the increased response time The proportional band width is easily adjusted from the bath front panel The width may be set to discrete values in degrees C or F depending on the selected units The optimum proportional ban...

Страница 54: ...ional band setting To accept the new setting and access the cutout set point press SET Pressing EXIT will exit the secondary menu ignoring any changes just made to the proportional band value S Accept the new proportional band setting 6020 Series Calibration Bath User s Guide 46 Fluid Temperature Heater Setting Proportional Band Stability Water 30 0 C Low 0 04 C 0 0004 C Water 60 0 C Low 0 04 C 0 ...

Страница 55: ... until it reaches a few degrees below the cutout set point temperature At this point the action of the cutout is determined by the setting of the cutout mode parameter The cutout has two selectable modes automatic reset or manual reset If the mode is set to automatic then the cutout will automatically reset itself when the bath temperature falls below the reset temperature allowing the bath to hea...

Страница 56: ...s R0 and ALPHA which characterize the resistance temperature rela tionship of the platinum control probe These parameters may be adjusted to improve the accuracy of the bath This procedure is explained in detail in Sec tion 11 The probe parameters are accessed by pressing SET after the name of the pa rameter is displayed The value of the parameter may be changed using the UP and DOWN buttons After...

Страница 57: ...nterface Parameters The serial RS 232 interface parameters menu is indicated by SErIAL Serial RS 232 interface parameters menu The serial interface parameters menu contains parameters which determine the operation of the serial interface These controls only apply to baths fitted with the serial interface The parameters in the menu are BAUD rate sample pe riod duplex mode and linefeed 9 12 1 Baud R...

Страница 58: ... period is indicated by SAmPLE Serial sample period parameter Press SET to choose to set the sample period The current sample period value is displayed SA 1 Current sample period seconds Adjust the value with UP or DOWN and then use SET to set the sample rate to the displayed value SA 60 New sample period 9 12 3 Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full d...

Страница 59: ...an IEEE 488 GPIB interface In this case the user may set the interface address within the IEEE 488 parameter menu This menu does not appear on baths not fitted with the interface The menu is indicated by IEEE IEEE 488 parameters menu Press SET to enter the menu 9 13 1 IEEE 488 Address The IEEE 488 interface must be configured to use the same address as the ex ternal communicating device The addres...

Страница 60: ...meters menu is indicated by CAL Calibration parameters menu Press SET five times to enter the menu 9 14 1 CTO Parameter CTO sets the limit of the over temperature cutout This is not adjust able by software but is adjusted with an internal potentiometer For the 6020 bath series this parameter should read as follows 6020 6021 6022 6024 CTO 310 C 210 C 310 C 310 C 9 14 2 CO and CG These parameters ca...

Страница 61: ...ctions all using remote com munications equipment In addition the heater power may be switched from low to high using the interface To enable the heater to be switched to high us ing the interface the HEATER switch must be set to the LOW position 10 1 Serial Communications The bath may be installed with an RS 232 serial interface that allows serial dig ital communications over fairly long distance...

Страница 62: ... repeatedly until the serial interface menu is indicated with SErIAL Finally press SET to enter the serial parameter menu In the serial interface parameters menu are the BAUD rate the sample rate the duplex mode and the linefeed parameter 10 1 2 1 Baud Rate The baud rate is the first parameter in the menu The display prompts with the baud rate parameter by showing BAUd Press SET to choose to set t...

Страница 63: ...SCII 10 after transmission of any carriage return The default setting is with linefeed on The mode may be changed using UP or DOWN and pressing SET 10 1 3 Serial Operation Once the cable has been attached and the interface set up properly the control ler immediately begins transmitting temperature readings at the programmed rate The set point and other commands may be sent to the bath via the seri...

Страница 64: ...listed in this section see Table 5 These commands are used with both the RS 232 serial interface and the IEEE 488 GPIB interface In ei ther case the commands are terminated with a carriage return character The in terface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters which determines a unique command A...

Страница 65: ...off The 6020 series baths have one control function with the digital interface This control function is for the heater settings To control the heater with the digital interface the front panel heater switch must be set to LOW The heater function is controlled with the F1 com mand This command is either set to 0 or 1 according to Table 4 The de fault setting is F1 0 which is LOW Sending a command w...

Страница 66: ...tional band setting pr op band pr pb 999 9 pb 15 9 Set proportional band to n pr op band n pr 8 83 Depends on Configuration Read cutout setting c utout c c 9999 x xxx c 620 C in Set cutout setting c utout n r eset Set cutout to n degrees c utout n c 500 Temperature Range Reset cutout now c utout r eset c r Read heater power duty cycle po wer po po 9999 po 1 Configuration Menu Probe Menu Read R0 ca...

Страница 67: ...tion parameter cg cg bg 999 99 bg 156 25 Set CG calibration parameter to n cg n cg 156 25 999 9 to 999 9 Read low set point limit value tl ow tl tl 999 tl 80 Set low set point limit to n tl ow n tl 80 999 9 to 999 9 Read high set point limit value th igh th th 999 th 205 Set high set point limit to n th igh n th 205 999 9 to 999 9 Miscellaneous not on menus Read firmware version number ver sion ve...

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Страница 69: ...acy of say 0 03 C over the range 40 to 160 C Choosing 80 C and 120 C may allow the bath to have a better accuracy of maybe 0 01 C over the range 75 to 125 C but out side that range the accuracy may be only 0 05 C 11 2 Measuring the Set point Error The first step in the calibration procedure is to measure the temperature errors including sign at the two calibration temperatures First set the bath t...

Страница 70: ...d as 100 193 and 0 0038272 re spectively Program the new values R0 and ALPHA into the controller Check the calibration by setting the temperature to tL and tH and measuring the errors again If desired the calibration procedure may be repeated again to further im prove the accuracy 11 4 Calibration Example The bath is to be used between 75 and 125 C and it is desired to calibrate the bath as accura...

Страница 71: ...tH 120 00 C measured t 119 914 C Compute errors errL 79 843 80 00 C 0 157 C errH 119 914 120 00 C 0 086 C Compute R0 R0 0 086 80 0 0157 120 0 120 0 80 0 0 00385 x x 1 100 000 100115 Compute ALPHA ALPHA 1 0 00385 120 0 0157 1 0 00385 80 0 x x 0 086 120 0 80 0 1 0 00385 0 0038387 Figure 10 Calibration Example ...

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Страница 73: ...ges in fluid level are dependent upon several factors specific to the environment in which the equipment is used A schedule cannot be out lined to meet each environmental setting Therefore the first year the bath should be checked weekly with notes kept as to changes in bath fluid Af ter the first year the user can set up a maintenance schedule based on the data specific to the application Heat tr...

Страница 74: ...ronment Some oils change their characteristics or become dirty after a period of use Always remove any foreign materials from the bath Silicone oils as well as others may evaporate off their lighter components over a period of time leaving the very viscous components remaining In addition some decomposition occurs which may impair the temperature stability of the bath When this happens the fluid i...

Страница 75: ... proof containers and appropriate safety equipment such as face shields gloves and body covering should be used WARNING Extreme danger of BURNS and FIRE Use safety equipment Use proper equipment and have fire safety equipment standing by 67 12 Maintenance Draining the Bath ...

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Страница 77: ...to blow when replaced the heaters may be shorted If you suspect that the heat ers are shorted or burned out contact an Authorized Service Center see Sec tion 1 3 for assistance The controller display flashes Cutout and the heater does not operate If the display flashes Cutout alternately with the correct process temperature check the following Wrong cutout setting The cutout disconnects power to t...

Страница 78: ...00 to 300 ohms be tween pins 1 and 4 depending on its current temperature Corrupt controller memory Initialize the memory by performing a Factory Re set Sequence described in a previous solution The controller controls or attempts to control at an inaccurate temperature If the controller appears to operate normally except that the bath s temperature does not agree with the temperature measured by ...

Страница 79: ...h of the proportional band until the temperature sta bilizes Refer to section 9 7 The controller does not maintain controller pa rameters or parameters are reset each time the power to the unit is removed Note Before performing the memory check you need to record the controller calibration parameters found in the CAL menu of the instrument and any user adjusted parameters that you have changed suc...

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Страница 81: ...ate fluid to between 1 and 1 5 inches below the lid If unsure on how to fill the chiller consult the chiller manual Water works for most applications After operating the chiller for a short period of time check the fluid level in the chiller More fluid may have to be added to the chiller due to fluid required to fill the newly attached system DO NOT use the chiller above it s maximum rec ommended ...

Страница 82: ...rease as the 6021 attempts to maintain the current set point 14 2 Chiller Parts and Controls The information contained here is for the chiller parts and controls and is in ad dition to that in the Section 7 Parts and Controls of this manual The auxiliary chiller controls for the 6021 bath are located on the rear of the controller panel The controls are illustrated in Figure 11 and include the On A...

Страница 83: ...heater position must be in low Chiller State F2 Off 0 On 1 75 14 Appendix Model 6021 Chiller Controller Operation 3 aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaa...

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